无定形Al2O3改性ZSM-5分子筛在热和水热条件下骨架铝稳定性研究  

The Stability of Framework Aluminum of ZSM-5 Zeolites Modified by Amorphous Al 2O 3 under Thermal and Hydrothermal Conditions

作　　者：张欣 欧阳颖[2] 罗一斌[2] 马来波 ZHANG Xin;OUYANG Ying;LUO Yi-bin;MA Lai-bo(The Institute of Seawater Desalination and Multipurpose Utilization.,MNR(Tianjin),Tianjin 300192,China;The Research Institute of Petroleum Processing,Sinopec(Beijing),Beijing 100083,China)

机构地区：[1]自然资源部天津海水淡化与综合利用研究所,天津300192 [2]中国石化石油化工科学研究院,北京100083

出　　处：《盐科学与化工》2020年第4期28-31,共4页Journal of Salt Science and Chemical Industry

基　　金：中央级公益性科研院所科研业务费专项资金项目(K-JBYWF-2017-T07)。

摘　　要：与未改性的低钠(w(Na 2O)<0.10%)ZSM-5分子筛相比,采用不同质量分数(w(Al 2O 3)为1.0%、3.0%、5.0%)的无定形Al 2O 3改性ZSM-5分子筛,通过在550℃焙烧3 h和800℃水热处理4 h、8 h、17 h后,观察晶体结构、化学形态、酸性和n-C 14催化裂解活性的变化规律。结果表明,适量无定形Al 2O 3改性的ZSM-5分子筛可适当提高水热结构稳定性,Al 2O 3与骨架铝相互作用来提高酸性中心保留,但不能稳定骨架铝和提高ZSM-5分子筛的水热活性稳定性。Compared to unmodified ZSM-5 zeolites of low sodium(w(Na 2O)<0.10%),the ZSM-5 zeolites modified by different amounts of amorphous Al 2O 3(w(Al 2O 3)=1.0%,3.0%,5.0%).The changes of crystal structure,chemical morphology,acidity and catalytic cracking activity of n-C 14 were observed after calcination at 550℃for 3 h and hydrothermal treatment at 800℃for 4 h,8 h and 17 h.The results showed that the ZSM-5 modified by appropriate amount of amorphous Al 2O 3 can improve the hydrothermal structural stability,and Al 2O 3 interacts with the framework aluminum to increase the retention of the acid sites,but it can’t stabilize the framework aluminum and improve the hydrothermal active stability.

关 键 词：无定形Al 2O 3 改性 ZSM-5 水热 骨架铝 稳定性 

分 类 号：TQ424.25[化学工程] O643.36[理学—物理化学]